⊦ newref_list(0, st) = [] ↔ 0 = 0
∀ st. newref_list(m, st) = [] ↔ m = 0 ⊦ newref_list(m +1, st) = [] ↔ m +1 = 0
[[CONCRETESIMPRULES : ([CSIMPGEN : nat generated by 0, +1;])]]